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From: Jeff King <peff@peff.net>
Subject: Re: Branches & directories
Date: Mon, 3 Oct 2011 03:44:12 -0400
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Cc: Hilco Wijbenga <hilco.wijbenga@gmail.com>,
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To: Matthieu Moy <Matthieu.Moy@grenoble-inp.fr>
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On Mon, Oct 03, 2011 at 09:41:29AM +0200, Matthieu Moy wrote:

> Jeff King <peff@peff.net> writes:
> 
> > Speaking of which; does anybody know of a git-aware ccache-like tool?
> > We already have a nice index of the sha1 of each file in the repository
> > (along with a stat cache showing us whether it's up-to-date or not).
> > Something like ccache could avoid even looking in the C files at all if
> > it relied on git's index.
> 
> It would be a bit harder than that I think. IIRC, ccache hashes the
> preprocessed file, hence it will notice if a .h file changed, even if
> it's outside the project.

Yeah, you'd have to maintain your own dependency tree, then. Which is
nasty (aside from the work involved), because I don't think you can
portably get the header dependencies out of the C compiler.

Oh well.

-Peff